摘要
采用计算流体动力学(CFD)数值模拟方法分析了湍流与化学反应相互作用下MILD煤粉燃烧的微观特征。比较了涡耗散模型(EDM模型)和涡耗散概念模型(EDC模型)对MILD煤粉燃烧的影响,两者得到的速度场、温度场、烟气成分等结果与实验结果符合较好.在此基础上分析了MILD煤粉燃烧湍流和化学反应的微观特征尺度,发现采用EDC模型能更准确地反映MILD煤粉燃烧的微观特征,即山于强烈的烟气内部再循环导致的高湍流混合和烟气稀释后低氧浓度下的缓慢化学反应.
The microscopic characteristics of turbulence-chemical interaction on pulverized coal MILD combustion were numerically analyzed by computational fluid dynamics （CFD） method. Compared the influence of Eddy Dissipation Model （EDM） with Eddy Dissipation Concept （EDC） Model, the numerical results agreed well with the experimental ones in the velocity fields, temperature fields and flue gas compositions. Moreover, the characteristic scales of turbulence-chemical interaction on pulverized coal MILD combustion were analyzed with two models. The results show that EDC model can more accurately reflect the characteristics of pulverized coal MILD combustion, i.e. high turbulent mixing and slow chemical reaction in local low oxygen concentrations due to strong internal recirculation of flue gas.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第1期187-191,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51276110)
教育部新世纪优秀人才支持计划资助项目(No.NCET-10-0584)
上海市自然科学基金项目(No.12ZR1414600)
